Liquid cooled abrasive grinder



Nov. 20, 1956 w. M. MANSFIELD ETA!- 2,770,931

LIQUID COOLED ABRASIVE GRINDER Filed April 13, 1953 WARREN M. AMNSF/ELD;ALBERT m OLLIFF, JR.,

INVENTORS.

BY MW ATTORNEY.

Warren M. Mansfield and Albert w. onirr, Jr.,

Glendale, Calif.

Application April 13, 1953, Serial No. 348,482

4 Claims. (Cl. 51-267) The invention relates to a liquid cooled grindingwheel.

Heretofore diamond wheels have been used to grindv tools of tungstencarbide. However such wheels are expensive, A cheaper wheel, known as agreen or silicon carbide wheel, is used as the thick wheel according tothe present invention. This type of wheel requires a liquid coolant toprevent glazing the wheel or burning the tool. It is not satisfacatoryto simply pour or drop a liquid coolant on the face of the Wheel becausewater does not get behind the tool to the surface which is being groundand where the heat is actually generated by friction.

An object of the invention is to provide a grinding Wheel supplied withliquid, which may be the usual emulsion of oil in water to cool a toolor other article being ground by the wheel by means of mist formed bysupplying the liquid through the pores of a thick wheel or along theside of a thin wheel by centrifugal force due to rotation of the wheel.

Thin grinding wheels are useful to reduce the web on a drill, or to cutthe chip breaker groove on a tool.

A further object of the invention is to provide a construction involvingparts which may be added to an existing motor driven grinding wheel toconvert the same to a wet grinder. This is accomplished by providing cupmembers having outer flanges at opposite sides of the central portion ofthe wheel, with a seal between the outer margin of each flange and theWheel to provide a chamber in each cup member and by leading the liquidcoolant into the chambers, whereby the rotation of the grinding wheeldraws the liquid out of such chambers through the pores of the wheel.

In the preferred form of the invention machine shop work is not requiredto provide a conduit in the shaft and hence the invention may be appliedto existing dry grinders in the field, by providing a nut with abaxialpassages and associated parts for leading the liquid coolant into thechambers along the outside of the shaft, the nut serving also to clampthe cup members and the grinding wheel together. It has been found thatthe side of the wheel which is adjacent the inlet for the liquid coolantwithdraws the major portion of the liquid coolant, with only a minorportion, if any, going to the far side of the grinding wheel. Accordingto the invention, the distribution of the liquid coolant in the wheel isequalized by providing a gasket for the cup member at each side of thewheel, the gasket at the inlet side of the wheel covering a largeramount of the central portion of the wheel than the other gasket so asto equalize the flow of liquid coolant into the wheel.

For further details of the invention reference may be made to thedrawings wherein:

Fig. 1 is a vertical sectional view of a modification wherein the liquidcoolant is fed to the grinding wheel without using an axial hole in theshaft.

Fig. 2 is a view in elevation looking at the outer end of the device ofFig. 1, the view being partly in section and part of the wheel beingbroken away.

A United States Patent 2,770,931 Patented Nov. 20, 1956 Fig. 3 is asectional view on line 33 of Fig. 1.

Referring to Fig. 1, the liquid coolant is supplied by a pipe, notshown, this pipe having a sliding fit in socket 57 in a hollow nut 58.Nut 58 has flat surfaces like 59 and 60, see Fig. 2, to receive a wrenchto screw the nut in place, the nut having an axial thread bore 61 forthe threads 62 on the outer end of the shaft 63. The annular margin 64at the inner end of the nut bears against the outer flat portion 65 ofthe cup member 66 so as to force its flange 67 against the grindingwheel 68, with an intervening gasket 69 cemented to the wheel by rubbercement indicated at 70. The gasket 69 extends inwardly to cover a majorportion of the central portion 71 of the wheel within the cup 66,leaving a small exposed portion 72 which receives the liquid coolant.Shaft 63 has a sleeve abutment 73 for the flat end 74 of a cup member 75at the inner side of the wheel. Cup member 75 has a flat annular flange76 as provided for on the other cup member, flange 76 having a gasket 77cemented to the wheel 68 by rubber cement indicated at 92. Gasket 77 isnarrow so as to leave all of the central portion 93 at the inner side ofthe wheel exposed to the liquid coolant in cup 75. By having gasket 69extend over a larger portion at the center of the wheel than the gasket78, the flow of coolant through the wheel 68 is equalized.

The reservoir 79 in cup member 66 and the reservoir 80 in cup member 75are in communication by channels like 81, four being shown through thelead bushing 82 at the hub of wheel 68.

The coolant flows through not 58 as follows. The nut 58 is bored ormachined outwardly of the outer end of threads 61 to provide an annularchamber 83 which communicates with the axial socket 57 in the outer endof the nut, leaving an internal annular wall 84 drilled lengthwise toprovide one or more ab-axial longitudinal passages, two being shown,like 85 and 86, the outer ends like 87 of these passages opening intothe chamber 83. The inner ends like 88 of the passages like 85 and 86open into an annular chamber like 89 in the inner end of the nut, andthis chamber opens into two or more holes like 90 and 91 through thewall of cup member 66, the passages 90 and 91 opening into reservoir 79.The socket 57 and the chamber or transverse passage 83 with the abaxialpassages 85 and 86 thus lead the liquid coolant around the outer end ofthe shaft 63, whereby it is unnecessary to provide a passage in theshaft.

The form shown in Figs. 1 to 3 has the advantage that a dry grinder inthe field can be changed over to a wet grinder without removing thegrinder to a machine shop for special machine operations, as it is onlynecessary to assemble the parts shown and clamp them in position bymeans of nut 58. Of course a suitable reservoir and associated partsincluding a supply pipe must be provided.

Various modifications may be made in the invention without departingfrom the spirit of the following claims.

We claim:

1. In cooling means for abrasive cutters including a grinding wheelhaving a shaft, the improvement which comprises a cup member coaxialwith said shaft at each side of the wheel, each of said cup membershaving an outer flange, a gasket between the outer margin of each ofsaid flanges and the wheel, each of said members providing a chamber atthe central portion of the wheel, said shaft having an abutment andhaving an outer end having threads, a hollow nut for said threads forclamping said cup members and said wheel together against said abutmentand conduit means including a passage extending through said nut andconnecting with said chambers for supplying a liquid coolant to saidchambers, one of said cup members being an outer cup member adjacentsaid nut, the extent of said gasket for said outer cup member over theinner portion of the outer side of said wheel being greater than theextent of said other gasket over the central portion of the other sideof said wheel to equalize liquid intake by said wheel. 5

2. In cooling means for abrasive cutters including a grinding wheelhaving flange members and a shaft having an abutment, with a pipe forsupplying a liquid coolant, the improvement which comprises a nut forclamping said flange members and said wheel together on said 10 shaftagainst said abutment and for supplying liquid coolant from said pipe tothe Wheel, said nut comprising a socket for said pipe, said nut havingan internal wall, having a bore having threads for said shaft, saidinternal Wall having longitudinal fluid passages therein outside of thethreads of its said bore and a transverse fluid passage in said nutconnecting said socket and said longitudinal passages.

3. In abrasive cutters, a combined clamping and coolant fluid conductingnut comprising a pipe socket at one 20 end of said nut, said nut havingan internal wall having an axial bore having threads, said internal wallhaving longitudinal fluid passages therein outside of the threads, ofsaid bore, and a transverse fluid passage in said nut connecting saidsocket and said longitudinal passages.

4. In abrasive cutters according to claim 3, in combi- 4 nation with cupmembers adapted to be clamped by said nut on opposite sides of agrinding wheel, each of said cup members having a chamber for a liquidcoolant for the Wheel, and connections between said chambers and saidlongitudinal passages.

References Cited in the file of this patent UNITED STATES PATENTS500,561 Carpenter et al July 4, 1893 533,958 King Feb. 12, 1895 618,293Ridley Jan. 24, 1899 796,466 Stolzenberg Aug. 8, 1905 813,348Sanford-Burton Feb. 20, 1906 919,456 Pope Apr. 27,1909 1,491,515 ChaseApr. 22, 1924 1,824,000 Walter Sept. 22, 1931 2,167,282 Murphy July 25,1939 2,378,070 Eastwood June 12, 1945 2,380,332 Scheer July 10, 19452,413,016 Wilkin et al Dec. 24, 1946 2,450,371 Coates Sept. 28, 19482,492,684 Coates Dec. 27, 1949 2,560,944 Garrison July 17, 19512,708,332 Riddell et al May 17, 1955

